The 24-year-old had to be stretchered from the field following a challenge with Blues defender Ryan Bertrand , and now the Brazilian international has told a reporter heâs expecting a lengthy lay-off.

Lucas will have to wait for a knee scan on Thursday to determine the true extent of the injury, but Reds manager Kenny Dalglish has called for calm until the official results are revealed.

âHe’s damaged his knee,â said Dalglish.

âWe don’t know what it is. We’ll get him looked at and take it from there.

âWe don’t know what it is so rather than speculate we are best waiting until we get the proper diagnosis tomorrow or the next day and we’ll let everybody know in due course.â

Immediately after the game, Lucas suggested to his Twitter followers that he is still hopeful the injury could be relatively minor.

‘Well done everyone tonight. I will have the scan to see how bad is my injury,’ he wrote.

‘Just send positive energy and I hope won’t be to bad. [sic]’

The much-improved midfield dynamo has featured in 12 Premier League games this season, as well as three of Liverpoolâs four Carling Cup matches.

He also played the entirety of Brazilâs four Copa America games in July.